This is the mail archive of the cygwin@cygwin.com mailing list for the Cygwin project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Accessing global variables causes segfault


I'm having some (further) issues porting some Unix code to cygwin.  I
have a
scenario where there are global variables defined in a shared library,
and referenced in the executable.  See the example below.  Yes I know
it's bad coding practice, but I'm hoping to port the code with the least
amount of re-writing as possible.  It works fine under Unix, but as you
can see from below, doesn't play well under cygwin.  Is there anything
I can do - apart from the obvious re-write.

Cheers,

Steve

[cdev]$ cat a.c
#include <stdio.h>
#include <stdlib.h>
extern void fx (void) ;
extern int myglobal ;

int
main (int argc, char **argv) {
        myglobal = 99 ;
        fx () ;
}
[cdev]$ cat b.c
#include <stdio.h>

int             *myglobal ;

void
fx (void)
{
        printf("here i am : myglobal = %d\n", myglobal) ;
}
[cdev]$ gcc b.c -o libb.dll -shared
[cdev]$ gcc a.c -o a -L. -lb
[cdev]$ a
Segmentation fault (core dumped)


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]